如何在android中创建年龄计算方法

import java.util.Calendar;

public class AgeCalculator {
    public static int calculateAge(String birthDate, String currentDate) {
        int age = 0;
        
        try {
            // 将出生日期和当前日期转换为Calendar对象
            Calendar birthCalendar = Calendar.getInstance();
            birthCalendar.setTimeInMillis(Long.parseLong(birthDate));
            
            Calendar currentCalendar = Calendar.getInstance();
            currentCalendar.setTimeInMillis(Long.parseLong(currentDate));
            
            // 获取出生日期和当前日期的年份、月份和日期
            int birthYear = birthCalendar.get(Calendar.YEAR);
            int birthMonth = birthCalendar.get(Calendar.MONTH);
            int birthDay = birthCalendar.get(Calendar.DAY_OF_MONTH);
            
            int currentYear = currentCalendar.get(Calendar.YEAR);
            int currentMonth = currentCalendar.get(Calendar.MONTH);
            int currentDay = currentCalendar.get(Calendar.DAY_OF_MONTH);
            
            // 计算年龄
            age = currentYear - birthYear;
            
            // 如果当前月份小于出生月份，或者当前月份等于出生月份但当前日期小于出生日期，则年龄减一
            if (currentMonth < birthMonth || (currentMonth == birthMonth && currentDay < birthDay)) {
                age--;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return age;
    }
}

String birthDate = "631123200000"; // 出生日期的时间戳（毫秒）
String currentDate = "1664563200000"; // 当前日期的时间戳（毫秒）

int age = AgeCalculator.calculateAge(birthDate, currentDate);
System.out.println("年龄：" + age);